--- /dev/null
+# Upstream patch that fixes spline interpolation:
+# https://github.com/veusz/veusz/commit/b4223800744034880fd1ca1165853636b31e576c
+diff -Naur old/veusz/helpers/src/qtloops/beziers.cpp new/veusz/helpers/src/qtloops/beziers.cpp
+--- old/veusz/helpers/src/qtloops/beziers.cpp 2017-09-23 11:10:46.000000000 +0300
++++ new/veusz/helpers/src/qtloops/beziers.cpp 2018-08-04 21:27:01.000000000 +0300
+@@ -1013,8 +1013,8 @@
+ return 0;
+ }
+
+- // factor of 0.1 introduced by JSS to stop more hooks
+- double const allowed = L2(b - a)*0.1 + tolerance;
++ // factor of 0.2 introduced by JSS to stop more hooks
++ double const allowed = L2(b - a)*0.2 + tolerance;
+ return dist / allowed;
+ /** \todo
+ * effic: Hooks are very rare. We could start by comparing
--- /dev/null
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+PYTHON_COMPAT=( python2_7 python3_{4,5,6} )
+
+inherit eutils distutils-r1 virtualx xdg-utils gnome2-utils
+
+DESCRIPTION="Qt scientific plotting package with good Postscript output"
+HOMEPAGE="https://veusz.github.io/"
+SRC_URI="https://github.com/${PN}/${PN}/releases/download/${P}/${P}.tar.gz"
+
+SLOT="0"
+LICENSE="GPL-2"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="dbus doc emf fits hdf5 minuit"
+
+CDEPEND="dev-python/PyQt5[widgets,svg,printsupport,${PYTHON_USEDEP}]
+ dev-python/numpy[${PYTHON_USEDEP}]"
+RDEPEND="${CDEPEND}
+ dbus? ( dev-python/dbus-python[${PYTHON_USEDEP}] )
+ emf? ( dev-python/pyemf[$(python_gen_usedep 'python2*')] )
+ fits? ( dev-python/astropy[${PYTHON_USEDEP}] )
+ hdf5? ( dev-python/h5py[${PYTHON_USEDEP}] )
+ minuit? ( || ( dev-python/iminuit[${PYTHON_USEDEP}] dev-python/pyminuit[${PYTHON_USEDEP}] ) )"
+DEPEND="${CDEPEND}
+ dev-python/setuptools[${PYTHON_USEDEP}]
+ dev-python/sip[${PYTHON_USEDEP}]
+ doc? ( dev-python/sphinx[${PYTHON_USEDEP}] )"
+
+PATCHES=("${FILESDIR}/fix_spline.patch")
+
+python_test() {
+ distutils_install_for_testing
+ cd tests || die
+ VIRTUALX_COMMAND="${EPYTHON}" \
+ VEUSZ_RESOURCE_DIR="${S}" \
+ virtualmake runselftest.py
+}
+
+python_install() {
+ distutils-r1_python_install
+ # symlink the license, bug #341653
+ rm "${D}/$(python_get_sitedir)"/${PN}/{COPYING,AUTHORS,ChangeLog} || die
+ mkdir -p "${D}/$(python_get_sitedir)" || die
+ cat >> "${D}/$(python_get_sitedir)"/${PN}/COPYING <<- EOF
+ Please visit
+
+ https://www.gnu.org/licenses/gpl-2.0.html
+
+ for the full license text.
+ EOF
+}
+
+python_install_all() {
+ distutils-r1_python_install_all
+
+ if use doc; then
+ dodoc Documents/manual/pdf/${PN}.pdf
+ docinto html
+ dodoc -r Documents/manual/html
+ fi
+
+ doicon icons/veusz.png
+ domenu "${FILESDIR}"/veusz.desktop
+ insinto /usr/share/mime/packages
+ doins "${FILESDIR}"/veusz.xml
+}
+
+pkg_postinst() {
+ xdg_desktop_database_update
+ xdg_mimeinfo_database_update
+ gnome2_icon_cache_update
+}
+
+pkg_postrm() {
+ xdg_desktop_database_update
+ xdg_mimeinfo_database_update
+ gnome2_icon_cache_update
+}